Find the time of relation between colli...

Find the time of relation between collision and free path of electrons in copper at room temperature .Given resistance of copper `= 1.5xx 10^(-8) Omega m` number density of electron in copper `= 8.5 xx 10^(28)m^(-3)`
charge on electron `= 1.6 xx 10^(19)C`,
mass of electrons ` = 9.1 xx 10^(-19) kg`
Drift velocity of free electron `= 1.6 xx 10^(-4)ms^(-1)`

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